They quote a "Maximum fair market value" of $1300 based on a couple of different methodologies.

In my (limited) experience, when banks forecast prices (for stocks, indices, FX rates etc) they always quote a number within a reasonable-sounding percentage of the current price, because not to do so risks being wrong and looking stupid.

This means that most of the time they are not far out, and when it really matters (eg 2008) they are miles out (and so is everyone else).

So even if BofAML actually thought that the "maximum fair market value" was significantly higher than $1300, I doubt they'd have said so, simply to avoid the reputational risk.